/Engine/Source/Runtime/Engine/Classes/PhysicsEngine/ConstraintInstance.h
Create physics engine constraint using physx actors.
void InitConstraint_AssumesLocked ( const FPhysicsActorHandle & ActorRef1, const FPhysicsActorHandle & ActorRef2, float InScale, FOnConstraintBroken InConstraintBrokenDelegate, FOnPlasticDeformation InPlasticDeformationDelegate )